Torsion set rotary jar



June vI8, '1935- J. A. KAMMERDINER ToRsIoN SET ROTARY JAR Filed 0013. 29, 1932 KNA/f/// ynj ZVY C Ixr a-downward drive, they depend upon the 40 depending upon gritfinvthe circulating fluid and abrasionof the contacting surfaces due to wear.

Patented June 18, 1935 ortica Y 2,005,228; t l Y ToasroN SET ROTARY .mav 'James Allen Kammerdiner, Los Angeles,v Calif. ,applic-stimmten 29, 1932, serial No. 640,139 p rciaims- (01.25927) l l This invention relates to a rotaryjar for use lin iishing operations, jarring tools or the likefin well holes. It appertains moreparticularlyto a jar having two sections connected for limited llongitudinal movementv and havingtripmeans tores strain theV sections lagainst longitudinal` movement at one end vof their travel andiarresting means to limit longitudinal movementyat the other end of their travel, and effectA a jarring Y action. 'I'he trip means is characterized by being releasable by an vangular movement-.of the sections. l Suchjarring tools .employing an upward blow depend -for emcientaction uponV the elastic stretch'vof 4the drill pipe which acts.as resilient means 'to produce an'impact of great magnitude.

accumulation oftheload of thedrillgpipe and associated parts supported thereon. Suchmetal-vv lic drill pipe has torsionalelasticityand the trip lo' means may be restrained against releaseby exert' ing a .torsional stress to counteract theftorsional component of a longitudinally `exerted stress. The present invention has `for its lobject'the provision of a VLiar, relying .'uponselected torsional y and longitudinal strpss'esfortripping. It is ap' parent that ifthefpitchl-of the threads on the shell andV mandrel-of the 'rotary ljar of the ytype disclosedinUfSafPatent #1,672,321",.granted to me June.' 5.,' .1928, 'is made great enough, the jar may be loi'elatecl'by takingadvantage of the relation' of torsional "stressto longitudinal stress as hereinbeforedescribem However, in practice the threaaswomdibepitchedm theoppositedirectmn 0 of` the character to avoid Vunscrewing of the '-,joints .between sections of the drill pipe. When the jar is so con- 'structedand used, dueto the largeareaof frictionalicontact, the reactions to release of -thetrip members` dependsnot only upon the torsional resiliency but also upon the resistanceto sliding vof the frictionally. engaged surfaces. yThis varies For-the reasons mentioned, it is impossible toaccurately govern -the intensity of the jarring action by the torsionalstressplaced on ,they jar. .s Furthermora due tothehe'avy stresses placed. on theftrip members excessive wear takes place and the jar'after short us'e'requiresservicing. Another object of thisrinventionis to provide a jar last mentioned disadvantages.

',Thesel vobjects arev accomplished by n'eans o f one embodiment oi' my "invention illustratedV in the accompanyingdrawing4in1which-fy Fig.' 1` is an axial section'through adarin set described which will obviate the position; Figs; 2 and 3 aresections as seen ony the lines correspondingly numbered in Fig. 1;'Fig. l4 isan enlarged `view of 'afragment of .the jar partly in section and partly in elevation as seen ata right angle to Fig. 1; and Fig. 5 is a sectional A view'of the fragment of the bowl. shown inFig. V4 5 looking ata different angle.

Referring with more particularity to the drawing;,the jar comprises a bowl A and a mandrel B telescopically engaged therewith. The trip is indicated'generally by C. f The bowl comprises a tubular shell 6 internally threaded at kits-ends. At the lower end an anvil nutl is attached being provided with a bore: to accornx'nodat'el travel of the mandrel. LAt the upper'end ahead 8 is attached. The head is provided `with a chamber' 8 of'reduced `diameter as compared 'with the bore of the shell; A stuiling boxl I0 vpacks awash pipe 'secured'to the mandrel. The lshell-6l is bored and tapped at diametrically oppositeY points-to receive threaded pintles il serving as journals for rollers I2. Th'e pintles maybe further secur'edin position and the shell strengthened by welds Il.' There are two longitudinally alined setsof rollers spaced in accordance with tracks on the mandrel. kKeys or ribs Hproject from the inner .wall of shell 6 below the rollers and there are' two ribs diametrically opposite-one another. These ribs'are of a width to occupy approximately one-eighth of the periphery leaving a space ofl three-eighths be tween-them. Y l

VDisposed within the4k shell l is the mandrel hav# ingahollow stemg Ilupon whichis a `hammer head i6 for coaction with anvil 1. The hammer head I0 and zanvil `1 limit expansion of the jar by their engagement.' The upper portionl'l of then'iandreliorms a plunger to work in cham'- ber' 9'.' -A wash pipeA I8 is attached to-the man# drel and -forxns a continuation of the bore 'of the o mandrelto providefor circulation through the jar. Relief "ducts I9.are provided for chamber 9. On 'the mandrel `are sloping tracks 20 inpthe nature-of interrupted threads. There are two sets' or longitudinallyalined tracks, one se't being diametrically opposite kthe other 4and the tracks in a set being spaced to accommodate the rollers |2.`Y Thetracks'hav'er a relatively greatdpitch and each `preferably occupies one quarter AofV the periphery of the bore of they shell. lAbove tracks 20 areffbosses 2i limiting by their side ywalls gagement with rollers l2 preventing'the riding of vvthe-rollers onto the tracks until the bosses have passed above the topmost rollers, thereby insuring completecontractiorrfoi 'thejan Ori the lis movement the rollers-are fully engagedy with the.

tracks; at the other extremity they are out of engagement and the bowl and mandrel are free for limited longitudinal movement in relation to one another. The spline acts to limitrotary movement of the bowl and mandrel iny relationl to one another and enables rotation of the drill string of which it forms a' part to be transmitted to a tool below the jar. string of drill pipe adjacent the lower end. a suitable tool being attached to the lower end of the string. The tool maybe rotated by means ofv the ,drill string. When it is desired to actuate the jar, the drill stringY is lowered to effect contraction of the jar sections and then turned, the rollers andv tracks engaging. A torsional strain is then maintained on the jarA and an upward pull exerted by means of the drill string. The `elasticity of the drill string enables energy to be stored in thedrillstring which 'isato1- sional strain and a tensile strain. The .tensile strain through the action of the rollers and track is resolved into components including a torque reactive to the torsional strain and when of suicient magnitude to overcome the torsionallstrain will cause the bowl and mandrel to rotaterela,

tive to one another and the rollers and` tracks to disengage and release the 'jar sections. The hammer and anvil are then sprung toward one another to produce a heavyjarring blow. Ob# viously the energy stored in the drill string and the tensile strain to effect release is directly proportional to the torsional stress exerted. Thus. the magnitude of the impact blowmay be governed bythe torsional stress; If it is desired to eifecta series of jarring blows-in rapid succession, the torsional stress is maintained, the drill string being raised and lowered while the trip automatically sets the jar and releases. upon sufficient tension being attained. f

1. A rotary jar consisting of two sections re lated for limited longitudinal movement, jarring means to arrest longitudinal movement of said sections at one end of-'thelongitudinal travel thereof to effect aY jarring action, trip meansv to interlock said sections at the other end of their longitudinal travel and enable angular movement, saidtrip means including an inclined engaging surface on one of said sections and a roller journaled on the other section disposed to be abutted therewith in one angular position and thereby restrain longitudinal movement of said sections, said inclined engaging surface being of sucient pitch for a predetermined longitudinal stress to cause said roller `to ride over said surface to anotheriangular position free of said surface for longitudinal movement of said sections to jarring position, saidtrip means being4 maintainable in interlocking relation by a torsional stress=against the action of a longitudinal stress exerted ,upon

saidsections.v 2. A rotary jarfconsisting of Vtwo sections re lated for limited longitudinal movementjar ring means to arrest longitudinal expansive movement The jar is placed in a` of said sections to effect a jarring action, trip means to interlock said sections in contracted relation and enable angular movement. said trip means including an inclined engaging surface on one of said sections and a roller journaled on the other sections disposed to be abutted therewith in one angular position and thereby restrain expansive movement of said sections. said inclined engaging surface being of sufficient pitch for a predetermined longitudinal sti-css lo cause said roller to ride 'over said surface' to another angular position free of said surface for expansive movement of said sections to jarring position. said trip means being maintainable in interlocking relation by a torsional stress against the action of a tensile stress exerted upon said sections.

3. A rotary jar comprising a hammer member and ananvil member telescopically connected for limited longitudinal movement, said members being provided with jarring means to arrest longitudinal movement of said members at one end of the longitudinal travel thereof to effect a jarring action, trip means to interlock said sections at the other end of their longitudinal travel and enableangularfmovement,said trip means including an inclined engaging surface on one of said members and a roller journaled on the other member disposedto be abutted therewith in one angular position and thereby restrain-longitudinal movement of said members. said inclined engaging surface being of sufficient pitch for a predetermined longitudinal stress to cause said roller to ride over said surface to another' angular po sition free of said surface for longitudinal movement of said members'to jarring position. said trip means being maintainable in interlocking relation by a torsional stress against the action of a longitudinal stress exerted upon said members.

4. A rotary jar comprising a'hammer member and an anvil member telescopically connected for limited expansive longitudinal movement, said members being provided with jarring means to arrest longitudinal expansive movement of said members to effect a jarring action, trip means to interlock said sections of contracted relation and enable angular movement. said trip means including'an inclined engaging surface on one of said members and a roller .iournaled on the other member disposed to be abutted therewith in one angular position and thereby restrain expansive movement of said members, said inclined engaging surface being of sufficient' pitch for a predetermined longitudinal stress to cause said roller to ride over said surface to another angular position free of said surface for expansive movement of said members to jarring position. said trip means being maintainable in interlocking relation by `a torsional stress against the action of a tensile stress exerted upon said members.

5. yA rotary jar comprising a bowl member and a mandrel'member telescopically connected for limited longitudinal movement. said members being provided with jarring means to arrest longitudinal movement of said members at one end of the longitudinaltravel thereof to effect a jarring action, trip means to' interlock said members at the other end of their longitudinal travel and enable angular movement, said trip means including an inclined engaging surface on said mandrel member and a roller journaled on said bowlmem' ber disposed to be abutted therewith in one angular position and thereby restrain longitudinal movement of said members, said inclined engaging surface being of suflicient pitch for apredetervpansive movement of said bowl and mandrelto mined longitudinal stress to cause said roller to ride over said suriace to another angular position free of said surface for longitudinal movement of said members to jarring position, saidtrip means being maintainable in interlocking relation by a torsional stress against the action of Aa longitudinal stress exerted upon said members.

6. A rotary jar consisting of a bowl and a mandrel telescopically connected for limited expansive longitudinal movement, jarring means t0. arrest longitudinal expansive movement of said bowl and mandrel to eiect a jarring action, trip means to interlock said bowl and mandrel in contracted relation and enable angular movement, said trip means including an inclined track. on said mandrel and an instanding roller journaled on said bowl disposed to be abutted with said track in one angular position and thereby restrain expansive movement of said ybowl and mandrel, said inclined engaging surface being of sufficient pitch for a predetermined longitudinal stress to cause said roller to ride over said track` to another angular position free thereof for exjarring position, said trip means being maintainable ininterlocking relation by a torsional l,

stress against the action of a tensile stress exert-l ed upon said jar.

7. In a rotary jar of the class described, a man'-V `drel member and a shell memberv relatively re`- ciprocable and oscillatable with'respect to each other and having cooperating impact surfaces, means for connecting said membersin a drill string, rollers journaled on one of said members and interrupted screw threads on the other member positioned for engagement with said rollers when said impact surfaces are separated and the members are in predetermined relative positions of rotation with respect to each other, saidthreads having sufiicient pitch to act 'upon said rollers to cause relative rotation between saidr members into jarring position in response to predetermined longitudinal stress between said 20' 

